Method of manufacturing steel sheets



- and having a smooth surface,

Patented May 5, 19 25.

umran STATES. PATENT OFFICE. 1

VERE B. BROWNE, F BBAOKENRIDGE, PENNSYLVANIA ASSIGNOR TO VALLEY HOLD ING CORPORATION, OF BRACKENBIDGE, PENNSYLVANIA,

PENNSYLVANIA.

A CORPORATION OF METHOD OF MANUFACTURING STEEL SHEETS.

No Drawing. Application To all whom it may concern:

Be it known that L-Vnnn B. Browne, Y a citizen of the United States, and a resident of Brackenridge, in the county of Alle- 5 gheny and the State of Pennsylvanim have made a new and useful Invention in Method of Manufacturing Steel Sheets, of which the following isja specification.

This invention relates to the manufacture of stamping steel, and particularly to the manufacture of high-grade steel sheets for use in automobile, metal furniture {and other trades where steel sheets having a highly finished surface and suitable for deep and difiicult stamping operations are required.

high-grade steel sheets:

from Steads brittleness may be uniformly manufactured with 5the standard sheet. mill equipment.

This, as well as other objects which will readily appear to those skilled in this particular art, I attain by means of,the method described in the specification and set forth in the, appended claims.

Iucarrying out this method, sheet bars of the proper thickness 39 to rolling temperature and rolled or broken down to approximately sixty per cent of the length of the sheets required. These semi-finished sheets or breakdowns are then annealed, pickled to' remove cold rolled to an extent necessary to eliminate all superficial surface defects formed during the hot rolling.

The sheets, after being subjected to this step of cold rolling, are matched, heated to a temperature suitable enough to avoid scaling, and are rolled to the length required. This. hot-rolling operation is carried on on a mill having highly polished smooth rolls.

The sheets after this hot-rolling operation are then annealed, pickled and finished in the regular way.

Since the surface of the sheets is smooth a method whereby that is, sheets free and length are heated the scale' and for rolling but low "mg a high-grade surface and suitable for filed. October 13, 1924. serial No. 743,498.

and free from defects due to the final hoti rolling on a mill having smooth highlypollshed rolls, it is not necessary to resort to cold rolling. in the finishing operation,

and the omission of cold rolling during the finishing operatlon avoids the occurrence of Stcads brittleness in the final anneal.

I find that, by means of this method, I- am able -'to produce sheets of uniformly high-grade surface and suitable for deep drawing and stamping operations.

Having thus described my invention, whatjI claim is 1. The method, which consists in "hotheating the same to a relatively low temperature, then in rolling the match sheets o length between rolls and then 1n annealing and pickling the sheets whereby steel sheets having a highgrade surface and suitable for. deep drawing and stampmg operations are produced.

rolling sheet bars to approximately sixty v per cent-of the finished length of the sheets An object of'this invention is to provide highly polished smooth 2. The method, which consists in breaking down sheet bars to approximately sixty per cent of the finished length of the sheets required, then in annealing the breakdowns, then in removing the scale by pickling, then in removing superficial surface defects by cold rolling, then in matching and heating the break-downs to a temperature for rolling, but not high enough to produce scaling, then in rolling the break-downs to length between highly polished-smooth rolls, then annealing the sheets and then in iekling the same whereby steel sheets havdeep drawing and stamping operations are produced.

VERE' i3. BROWNE.

suitable 1 

